Page 1
EQUIPMENT PROFILE
POSTSCRIPT:
SONY
CDP-1
DIGITAL
DISC PLAYER
01
AUDIO
Manufacturer's
Frequency Response:
Specifications*
Hz to 20 kHz,
5
±0.5 dB.
S/IN
Ratto:
Greater
than
90
dB.
Channel Separation: Greater than 90
1 kHz.
dB at
Harmonic
kHz.
Distortion: 0.004%
at
Company Address:
Ridge, N.J.
For
literature,
For
complete
November 1982
see
I
Sony Dr.,
07656.
No.
circle
list of specifications,
94
issue,
page
Park
43.
Here is
fort
remarkable
which I tested for the November 1982
issue
you will recall that
time
test record
64
a "better
to
quantify
of Audio.
I
had hoped to have a definitive
-late
the
Sony CDP-101
with which to
-than
performance
If you read
right
-never"
of the
DAD player
report,
that
up to press
measure the
ef-
performance of
player in
the people at
Philips
player
such disc that
a copy.
good excuse to borrow
an
of the Compact
system) came
And
the new digital disc
objective
Sony
I know of and
of course,
manner. At last,
(co -inventors
Dig tal Disc
with the first
up
loaned me
that gave
back the
with
me a
DAD
player,
Compact Digital Discs I hadn't audi-
tioned before.
Contents of the
The
Sony
YEDS
2) is entitled
for
Signal
with
along
Test
Disc (catalog
Performance
a couple of
Test
Disc
"Test
AUDIO/JANUARY
C.D. Type
Check."
number
It
new
con
1983
1
-
Page 2
tains
a total of
test signals and,
has
also
39 separate
like
an encoded
all digital
"Table of Con-
tents" listing the number and
these
selections.
Band 1 is a
recorded at 0 dB
signal
channels. (Recall
digital disc system
cordable level available.)
log
tape or disc
available headroom beyond
Bands 2 through
quencies of
kHz, 7 kHz,
kHz, 5
kHz and 20
same 0 dB
These
bands
frequency response,
back
1 -kHz, reference -level
level on both
that "0 dB"
is the
Unlike ana-
recording, there
11
contain
100 Hz, 200
Hz,
10 kHz, 16 kHz,
kHz, all recorded
level and on both
are used to check
THD versus
highest
0 dB.
channels.
frequency, and the presence
modulation noise.
12 through 20 contain
Bands
test signals on
at progressively
ed
levels, beginning at 0 dB
signal
followed by levels of
- 10,
-20,
These
signals
ity
the player as
of
level.
Band 2
groove" analog
"silent
is used to check
both channels,
lower and
-60, -80,
are used to check
well as
is
the digital
equivalent
the player's signal-to-
-1, - 3, - 6,
and -90
THD versus
recording
noise ratio.
Bands 22 and
SMPTE-type
7 kHz in a
- 10
19 and 20
tain
at
and -10
0
Bands
quencies
kHz at 0 dB
20
left
the
These signals
system's
Bands 34 and 35
ty.
wave signals
transient
The
Compact
emphasis
IM test signal
4:1 ratio) at
while Bands
dB,
kHz twin tones
dB
26 through 33
100 Hz, 1 kHz,
of
level, recorded
channel
are used
channel
at
response measurement.
standards
Digital
and de
istics involving
15
and
have correct
tics, bands
frequencies
corded
should
To
µS.
de -emphasis
through 38 contain
36
1,
of
that during
so
reproduce
- 4.53, and -9.04
23 contain
levels.
and
separation
100 Hz and
developed
Disc incorporate
-emphasis
time constants
test
5,
dB
a two-tone,
(400 Hz and
levels
24 and 25 con-
contain
10 kHz and
then on the
to measure
contain square
character-
whether players
characteris-
16 kHz,
and
playback
levels of -0.37,
respectively.
bands or
discs,
length of
in this
re-
is no
fre-
spot
Hz,
500
18
at the
play-
of any
1 -kHz
record-
lower
and
dB.
linear-
of a
and
0 and
of
recorded
fre-
first on
right.
the
capabili-
for
1 kHz
for the
pre -
of 50
test
re-
they
1-
Fig.
Frequency
response
separation.
1
Fig. 3-
Distortion
vs. frequency.
-
and
cF--
-20 --
-30
.40 ,..._
I3 -50
a
} -60 -
á
...
lp
41
-80'r....
_so
.004
i
-!;
FREQUENCY RESPONSE
t
[._..
100
SEPARATION
FREQUENCY
Ix
- Hz
Fig. 2-THD for
test tone at 0 dB
was too low to
measured
analyzer
80 dB.
on a spectrum
with
a
There was also
1 -kHz
a
level
be
range
.-
of
no
evidence of modulation
noise on the
Sony CDP-101.
`- FOUENC
Fig. 4-Twin-tone
was reproduced
signal
no
with
evidence
IM test
of
modulation products
within the audio
range.
AUDIO/JANUARY 1983
65
Page 3
"There is no evidence
modulation noise or
harmonic
the
analyzer's
distortion
range."
within
of
`ÁRT
P
Shure
is the
tridge
rade the
\`near traçNith
turntechon
P
mode r{Dunant
yourte cartridge
screw,
scre
u
wires
no
necessar
For
Mount
Úntab\es o
ca9°bi\hies.
Send for
broc
Brothers
Shure
king
t °v°
\i
{ \s
he
t
d you
an bt\ityr
yr
ack°
tr
o\ign
or
at
great
phono
imites
p``69
hure
Inc., 222
roven
proven,
P
direct
o
ester('
Se?
e\needs'
`a
you've
r{orma
conne
ent
sound,
cartridge
y
Hortrey
Ph°áS,Nay
t e
convention\
P
-M° «eet
Hour
tighten
in
share
f
got
-with
ere
9
d9
o0
Avenue, Evanston,
car-
o{
tio
'to
meet
o
eking
cents
Shure
to
any
one
,M
®
IL
60204
test
tone runs
single
All of
time
Bands
is
all of
again
seconds,
61
of the
recorded
for a
run through
to
-tone,
the other
moving
in which to
1
through
56 seconds
run for 56 sec-
38
time on
minutes and
that on one
only
43/4 inches
Finally, band 39
concludes
erence
dB
minutes
ample time
other
quency
give even the slowest
ter
measurements.
run for 1 minute and
bands
onds
Sony test disc
test tone,
This last
level.
and 56
desired
testing.
plenty
12 through
each.
with an extended
for anyone
of
Total recorded
seconds-and
which measures
a disc
in
diameter!
Measurements
Figure 1 is
playback frequency
curve) and channel
Sony CDP-101
test frequency on the
Hz, it
or separation below
listened
material in my earlier tests and
this
pect
deteriorate
bass frequencies.
As for
should be
as a
not
was
re
that response or separation
residual noise
possible
a good deal
to
I have no
-test,
in any way at still
the separation
more
evidence of the discrete
quencies on the 'scope
these measurements.
-90 dB or better
residual
noise
-by -point
a point
response (upper
separation
player. Since
test disc
to plot
that point.
reason to sus-
plot
accurately
since
plot,
spot test
when
The readings of
really consisted of
from
analog elec-
the
the
of program
described
tronic circuitry of the player
minute amounts of
ever
noise
the
digital
In an
tion noise could
playing back a steady
output of
lyzer while
ence -level signal
sults are shown
lyzer 'scope
evidence of
monic
dB
of dynamic
lates
Figure
tion versus frequency
frequencies
have
might
been
playback circuitry
attempt
to see
the player to
playing
on the
in
of
photo
modulation
distortion
with the
range
to a percentage
is a plot of
3
were provided
as
quantization
generated
if
any
be detected
tone,
a
spectrum
1 -kHz
the
test disc.
the spectrum
Fig. 2.
noise or
There is no
analyzer's
80 dB
(-
of 0.01%).
harmonic
for as
record
ref-
1 -kHz
at 0
full 14
providing
mid
-fre-
bands
lab tes-
make
11
each;
the
24
side of
plot of
for the
lowest
was 100
response
Having
again
would
lower
shown,
no
I
saw
fre-
making
what-
and
by
itself.
modula-
when
I fed the
ana-
refer-
Re-
ana-
har-
of
80
trans-
distor-
many test
the
on
test
Sony
tion
0.01%
test signals
ing that THD of a digital
nal
signal
for a 1 -kHz signal at
- 20 dB.
somewhat, to an
- 10
at -20
rate within
record
SMPTE
pattern as THD.
measured an IM of 0.0075%,
-10
creased to 0.02%.
should remind you that
about a disc
not an amplifier or preamplifier!
I went through the
twin
from 20
4, no IM products showed
the sweep. Only
themselves are evident
in
hand
disc.
remained
for the 0 dB level at
were recorded.
tends to
rise rather than
levels, I also measured
As
expected,
record level and to - 0.025%
dB
Linearity
dB.
0.1 dB all
level down to -80
IM followed
level, the IM
dB
recording and player, and
-tone IM on the spectrum
Hz
20 kHz.
to
of the screen.
side
"The separation
more accurately
be
described
it
noise
as a
plot.
harmonic distor-
Total
consistently
levels
insignificant 0.01%
remained accu-
the way
much the
At
0 dB
At this point
motions
As
the two
plot would
residual
I saw
none of the
discrete test frequencies."
Signal-to-noise
unweighted,
when an A -weighting
in
serted
emphasis
dB
against
ample), but
dB
test disc
the
was accurate
(I measured -9.1
a
specified
is more
meter
and/or
splitting such
It's
always
tion of what our ears
the delayed
case,
test disc served
reviewer. The enthusiasm
this
expressed
the
tal audio discs
Sony
CDP-101
contradicted
measurements.
hearing is still
my
measured 91.0 dB,
increasing to 95.5
network
measurement path.
dB at
-9.04
who's to say
accurate
player when
hairs?
nice to get
in
the
in
in any way by
tell us.
arrival of
a good purpose
November
player
general
nice
It's
reasonably
Leonard
below
which these
Recogniz-
recorded sig-
fall
lower
at
the THD
-10 and
of
THD did
dB!
record
rise
from
0 dB
same
level, I
while at a
at
number in-
I think
we're talking
plotting
of
analyzer,
in Fig.
shown
up across
test tones
at the
right-
dB
was in-
De -
to within 0.1
10 kHz, as
for
dB,
whether
than Sony's
ex-
my
we're
lab confirma-
In this
the Sony
for
that I
for
issue
for
and
has not been
to
digi-
lab test
the
know that
acute!
Feldman
I
Enter No. 26 on
Reader Service
Card
Loading...